Acoustic coupler



FIG. 1 is a perspective view of the acoustic coupler illustrating my new design.

FIG. 2 is a top plan view of the acoustic coupler.

FIG. 3 is a front elevational view of the acoustic coupler.

FIG. 4 is a bottom plan view of the acoustic coupler.

FIG. 5 is a rear elevational view of the acoustic coupler.

FIG. 6 is a right end view of the acoustic coupler.

FIG. 7 is a left end view of the acoustic coupler. 

The ornamental design for the acoustic coupler, substantially as shown. 